package net.bwie.realtime.jtp.dwd.log.functionlx;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import net.bwie.realtime.jtp.utils.DateTimeUtil;
import org.apache.flink.api.common.state.ValueState;
import org.apache.flink.api.common.state.ValueStateDescriptor;
import org.apache.flink.configuration.Configuration;
import org.apache.flink.streaming.api.functions.KeyedProcessFunction;
import org.apache.flink.streaming.api.functions.ProcessFunction;
import org.apache.flink.util.Collector;

public class AdjustIsNew extends KeyedProcessFunction<String, String, String> {

    // step1. 声明状态
    private transient ValueState<String> firstDateState = null ;

    @Override
    public void open(Configuration parameters) throws Exception {
        // step2. 初始化状态
        firstDateState = getRuntimeContext().getState(
                new ValueStateDescriptor<String>("first-date", String.class)
        );
    }

    @Override
    public void processElement(String value, Context ctx, Collector<String> out) throws Exception {
        // step3. 获取状态值
        String firstDate = firstDateState.value();

        // 解析字段值
        JSONObject jsonObject = JSON.parseObject(value);
        String isNewValue = jsonObject.getJSONObject("common").getString("is_new");
        Long tsValue = jsonObject.getLong("ts");

        // todo isNew = 1  -->   firstDate = null，  firstDate = 有值
        if("1".equals(isNewValue)){
            if(null == firstDate){
                // step4 更新状态值
                // 此时is_new正确，状态值更新为第一次访问日期
                firstDateState.update(DateTimeUtil.convertLongToString(tsValue, DateTimeUtil.DATE_FORMAT));
            }else{
                if(!firstDate.equals(DateTimeUtil.convertLongToString(tsValue, DateTimeUtil.DATE_FORMAT))){
                    //此时is_new属于异常，需要纠正，设置为0
                    jsonObject.getJSONObject("common").put("is_new",0);
                }
            }
        }
        // isNew = 0  -->   firstDate = null，  firstDate = 有值
        else{
            //当用户早早登录访问，当时实时应用后来处理，用户第一次访问时，firstDate为null
            if(null == firstDate){
                //设置一个昨天日期即可
                firstDateState.update(DateTimeUtil.convertLongToString(tsValue - 86400000,DateTimeUtil.DATE_FORMAT));
            }
        }

        // 输出数据
        out.collect(jsonObject.toJSONString());
    }
}
